<template>
  <div>
    <div class="search">
      <input v-model="keyword"
             type="text"
             class="search-input"
             placeholder="输入城市名或拼音">
    </div>
    <div class="search-content"
         ref="search"
         v-show="keyword">
      <ul>
        <li class="search-item boder-bottom"
            v-for="item of list"
            :key="item.id"
            @click="handleCityClick(item.name)">
          {{item.name}}
        </li>
        <li class="search-item boder-bottom"
            v-show="hasNoData">
          没有找到匹配数据
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapMutations } from 'vuex'
export default {
  name: 'CitySearch',
  props: {
    cities: Object
  },
  data () {
    return {
      keyword: '',
      list: [],
      timer: null
    }
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  computed: {
    hasNoData () {
      return !this.list.length
    }
  },
  watch: {
    keyword () {
      if (this.timer) {
        clearTimeout(this.timer)
      }
      if (!this.keyword) {
        this.list = []
        return
      }
      this.timer = setTimeout(() => {
        const result = []
        for (let i in this.cities) {
          this.cities[i].forEach(value => {
            if (value.spell.indexOf(this.keyword) > -1 || value.name.indexOf(this.keyword) > -1) {
              result.push(value)
            }
          })
        }
        this.list = result
      }, 100)
    }
  },
  mounted () {
    // 这里用定时器的原因：不加定时器better-scroll不能起作用，页面不能滚动
    // 而且定时器的时间我也不知道原因为啥要这么久，但是实际上没有延时
    setTimeout(() => {
      this.scroll = new Bscroll(this.$refs.search)
    }, 2000)
  }
}
</script>

<style lang="stylus" scoped>
@import '../../../assets/styles/varibles.styl'
.search
  height 36px
  padding 0 5px
  background $bgColor
  .search-input
    box-sizing border-box
    width 100%
    height 31px
    padding 0 45px
    line-height 31px
    text-align center
    border-radius 3px
    color #666
.search-content
  z-index 1
  overflow hidden
  position absolute
  top 79px
  left 0
  right 0
  bottom 0
  background #eee
  .search-item
    line-height 31px
    padding-left 10px
    background #fff
    color #666
</style>
